Pascal's Mystic Hexagram

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Pascal's Mystic Hexagram is a hexagon which is inscribed in a circle and which has no pair of opposite sides parallel. Pascal's Mystic Hexagram was discovered by Blaise Pascal when he was sixteen years old and he called the hexagon Mysterium Hexagrammicum.

Pascal's theorem on the Mystic Hexagram states that for every Mystic Hexagram, the three points at which opposite sides intersect are collinear.